Vanessa left home at 8.35 a.m. and drove towards the mountain which was 690 km away. For the first 222 km, she was travelling at 74 km/h. Then she increased her speed by 4 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the mountain?
(a)
Time taken to travel 222 km
= 222 ÷ 74
= 3 h
Distance of the remaining journey
= 690 - 222
= 468 km
Speed for remaining journey
= 74 + 4
= 78 km/h
Time taken to travel remaining journey
= 468 ÷ 78
= 6 h
Time taken to travel the whole journey
= 6 + 3
= 9 h
(b)
9 h after 8.35 a.m. = 5.35 p.m.
Answer(s): (a) 9 h; (b) 5.35 p.m.